GB2211663A - Common casing for multiple capacitor - Google Patents
Common casing for multiple capacitor Download PDFInfo
- Publication number
- GB2211663A GB2211663A GB8823781A GB8823781A GB2211663A GB 2211663 A GB2211663 A GB 2211663A GB 8823781 A GB8823781 A GB 8823781A GB 8823781 A GB8823781 A GB 8823781A GB 2211663 A GB2211663 A GB 2211663A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- casing
- inner casings
- capacitor elements
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 title claims description 79
- 238000000465 moulding Methods 0.000 claims description 30
- 229920003002 synthetic resin Polymers 0.000 claims description 23
- 239000000057 synthetic resin Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229920005668 polycarbonate resin Polymers 0.000 claims description 4
- 239000004431 polycarbonate resin Substances 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims 1
- 239000007789 gas Substances 0.000 description 23
- 229920005989 resin Polymers 0.000 description 15
- 239000011347 resin Substances 0.000 description 15
- 229920000647 polyepoxide Polymers 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 229920005990 polystyrene resin Polymers 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/02—Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
2r, r 2 16 13' MOLDED CAPACITOR The present invention relates to a molded
capacitor.
A molded capacitor is made by connecting a plurality of capacitor elements electrically and molding the assembly with synthetic resin. With this type of capacitor in which the capacitor elements are covered by resin, impregnation of resin at the ends of the capacitor elements has to be sufficient. otherwise, partial discharge will tend to occur, thus causing breakdown of the capacitor. But, it is very difficult or almost impossible to completely impregnate the capacitor elements with synthetic resin at their recessed end portions. Thus, the capacitor elements tend to suffer from corona discharge at their end portions.
With the prior art molded capacitors, this problem is tackled by reducing the voltage assigned to each capacitor element. This increases the number of capacitor elements and makes the capacitor bulky and expensive.
In the light of these drawbacks with the prior art molded capacitors, the present inventors have conceived the idea of encasing each capacitor element in a stiff container, filling an insulating gas therein, and molding the containers with synthetic resin.
With a prior art molded capacitor, each capacitor element is vacuumpacked in a flexible synthetic resin film pack and an insulating gas is filled in the film pack. With this type of capacitor, it is relatively easy to vacuum-pack the capacitor elements and then fill the film packs with an insulating gas. But, the insulating gas in the film packs expands or contracts in molding the vacuum-packed capacitor elements with synthetic resin, so that air gaps are liable to develop between the film packs and the molding resin. The air gaps may induce corona discharge. If the film packs are in tight contact with the molding resin and no air gaps develop therebetween, the film packs cannot contract after it has expanded by the temperature rise during molding. This will cause the pressure of the insulating gas in the film packs to drop, thus lowering the corona discharge starting voltage.
An object of the present invention is to provide a molded capacitor which obviates the abovesaid shortcomings.
The inventors reached a concept of encasing the capacitor elements in a stiff casing having a shaperetaining property, filling an insulating gas in the casing, electrically connecting a plurality of the encased capacitor elements together, and molding the assembly with synthetic resin.
The inventors also noticed the necessity that the casing should have a good adhesion with the molded resin at its outer periphery, and have completed the present 2 invention.
k, in accordance with the first embodiment of the present invention, there is provided a capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in the respective inner casings; the inner casings being filled with an insulating fluid; the capacitor elements being connected electrically with one another to form an assembly; and an outer housing formed by molding the assembly with synthetic resin.
In accordance with the second embodiment of the present invention, there is provided a capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in the respective inner casings; the inner casings being each filled with an insulating fluid and molded with synthetic resin to seal the insulating fluid therein; the capacitor elements being connected electrically with one another to form an assembly; and an outer housing formed by molding the assembly with synthetic resin.
In accordance with the third embodiment of the present invention, there is provided a capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in the respective inner casings; the inner casings being each filled with an insulating fluid and molded with synthetic resin to seal the 3 insulating fluid therein; the capacitor elements being connected electrically with one another to form an assembly; and an outer casing for containing the assembly with an insulating gas sealed therein.
The container for the capacitor element is less subject to deformation even if the insulating gas or oil in the container expands and contracts, because not only is it made of a material having a shape retention or stiffness but also it is reinforced with the molding resin. The molding resin impregnates the glass fiber material wound around each container so as to improve the bonding strength between the container and the resin molding.
According to the present invention, air gaps hardly develop between the resin molding and the containers. This reduces the possibility of causing corona discharge and makes it possible to increase the voltage assigned to each capacitor element and reduce the number of capacitor elements in one capacitor. This makes the capacitor more compact.
Since each of the molded capacitor elements can be tested individually for performance before being connected together, defective elements can be easily picked out before assembly. This will lead to a reduction in the number of defective capacitors.
Further, since each capacitor element is encased in a 4 stiff container having a shape retaining property, the molding resin is kept out of direct contact with metalsprayed electrical connecting points of the capacitor elements. Thus, the connecting points are less susceptible to the stress produced when the resin molding contracts during hardening.
other features and objects of the present invention will become apparent from the following description taken with reference to the accompanying drawings, in which:
Fig. 1 is a sectional view of the first embodiment of the capacitor according to the present invention:
Fig. 2 is an enlarged sectional view of a portion of the same; Fig. 3 is a sectional view of the second embodiment; and Fig. 4 is a sectional view of the third embodiment.
As shown in Fig. 1, the capacitor 1 in the first embodiment of the present invention comprises a plurality of encased and molded capacitor elements 11 connected together electrically with one another, and an outer housing 2 for the capacitor elements formed by molding a synthetic resin. The outer housing 2 is integrally formed with bushings 3.
As shown in Fig. 2, each encased and molded capacitor element 11 comprises a container or casing 4 and a capacitor element 5 housed therein. The casing 4 is filled with an insulating gas such as SF6 gas or nitrogen gas and has a glass fiber material 12 wound around its outer periphery. This casing is encapsulated in a molding of a synthetic resin so as to hermetically seal the insulating gas. The capacitor element 11 is manufactured in the following manner.
Firstly a casing 4 is prepared. The casing 4 comprises a body 4a having an open top and a lid 4b closing a top opening of the body 4a. The body 4a and the lid 4b are both made of synthetic resin and formed with holes 7 and 71 for lead wires 6 of the capacitor element 5, respectively. The casing 4 ha,s inner dimensions slightly larger than the outer dimensions of the capacitor element 5 which comprises dielectric layers and electrode layers alternately wound in a spiral-shape. The lid 4b is put on the body 4a so that a gap 8 will be formed therebetween. The gap 8 and gaps 9 formed between the lead wires 6 and the holes 7 and 7' should be large enough to allow the insulating gas to pass into the casing 4 but not so large as to permit the invasion of a highly viscous synthetic resin into the container when the container is molded.
The inner casing 4 should be made of a stiff or rigid material having high heat resistance and insulating and shape-retaining properties, such as polyester resin, polystyrene resin and polycarbonate resin.
6 After encasing the capacitor element 5 in the body 4a, the lid 4b is put on the body with the lead wires 6 having their ends drawn out of the casing 4 through the holes 7 and V.
After the outer surface of the casing 4 has been roughened in the manner which will be described below, the glass fiber material 12 is wound around the outer periphery of the casing 4. The casing is then put in a metal mold and the mold is evacuated. An insulating gas such as SF6 gas or nitrogen gas is admitted into the mold. Then, a highly viscous synthetic resin such as epoxy or urethane resin is poured intolbetween the mold and the casing 4. After the resin has hardened, it is released from the mold.
The casing 4 is thus encapsulated or molded (first molding) in the molding 10 of synthetic resin which serves to fill up the gap 8 between the casing body 4a and the lid 4b and the gaps 9 between the lead wires 6 and the holes 7 and 71 so as to hermetically seal the insulating gas in the casing 4. A numeral 10 indicates a molded layer.
A plurality of molded capacitor elements 11 thus produced are connected in parallel and series with one another and put in a metal mold. A synthetic resin (preferably epoxy resin) is poured into the mold (the second molding), hardened and then released from the mold. The molding by the second molding forms an outer housing. The 7 1 molded capacitor according to the first embodiment is thus made. An insulating oil may be used instead of an insulting gas.
The capacitor of the second embodiment shown in Fig. 3 comprises a plurality of encased and molded capacitor elements 11 of the same type as in the first embodiment. The capacitor elements 11 are housed in a metal casing 13 and an insulating gas such as SF6 gas or nitrogen gas is filled in the casing 13.
The casing 13 comprises a body 13a having its top open and a lid 13b bonded to the body 13a by welding or the like. Bushings 3 3:re mouhted on the lid 13b to connect lead wires 6 from the capacitor elements 11.
With this arrangement, even if the outer casing 13 should lose its gastightness, the inner casings 4 can keep their respective capacitor elements 11 gastight. Since the capacitor elements 5 can thus maintain their high insulating property for a long time and are free from moisture even if the moisture invades the outer casing 13, not only will the reliability of the entire capacitor be greatly improved but also its service life will be extended considerably.
on the other hand, even if the insulating gas in one of the inner casings 4 should leak out, the pressurized insulating gas filling the outer casing 13 will serve to keep the gas pressure in the inner casings 4 from dropping.
8 This prevents the corona discharge starting voltage from dropping. Further, even if one of the inner casings 4 should lose its gastightness, the outer casing 13 will protect the capacitor elements 5 in the inner casings 4 from moisture. The deterioration of the capacitor will thus be prevented.
in the third embodiment shown in Fig. 4, a plurality of capacitor elements 5 are encased in the respective casings 4 and are encapsulated in an outer housing 2 formed by molding a synthetic resin such as epoxy resin. This embodiment is different from the first embodiment in that the molding is carried out-only once, not twice as in the first embodiment, to hermetically seal the insulating gas. In this embodiment, too, an insulating oil may be used instead of an insulating gas.
In any of the embodiments, the casing 4 comprises the body 4a and the lid 4b and is made of polyester, polystyrene or polycarbonate resin. It has such a thickness as not to be deformed by the expansion and contraction during molding.
In any of the embodiments, the casing 4 should preferably have its outer periphery roughened. The roughened surface may be formed by etching or sandblasting or by electrostatically flocking the outer periphery with short fibers of synthetic resin. Its roughness should be set at about 10100 microns in terms of the difference of 9 height of high portions or the length of fibers. It is not necessary to roughen the entire outer periphery of the casing 4 but only part of the outer periphery may be roughened where the resin molding is most likely to peel off the casing 4.
In the preferred embodiments, polyester, polystyrene or polycarbonate resin used for the casing shows good adhesion to epoxy resin so that the casing can be strongly bonded to the resin molding.
Further, by the pro-vision of the roughened surface on the outer periphery of the casing, the resin can infiltrate into the the voids of the roughened surface or into between the fiber flocks so as to strengthen the adhesion between the casing and the molding layer.
i 10
Claims (8)
1. A capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in said respective inner casings; said inner casings being filled with an insulating fluid; said capacitor elements being connected electrically with one another to form an assembly; and an outer housing formed by molding said assembly with synthetic resin.
2. A capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in said respective inner casings; said inner casings being each filled with an insulating fluid and molded with synthetic resin to seal said insulating fluid therein; said capacitor elements being connected electrically with one another to form an assembly; and an outer housing formed by molding said assembly with synthetic resin.
3. A capacitor comprising a plurality of inner casings having a shape retaining property; capacitor elements mounted in said respective inner casings; said inner casings being each filled with an insulating fluid and molded with synthetic resin to seal said insulating fluid therein; said capacitor elements being connected electrically with one another to form an assembly; and an outer casing for containing said assembly with an insulating gas sealed therein.
4. A capacitor as claimed in any of claims 1 - 3, wherein said inner casing is made of polyester, polystylene or polycarbonate resin.
5. A capacitor as claimed in any of claims 1 - 3, wherein at least part of the outer periphery of said inner casing is roughened.
6. A capacitor as claimed in any of claims 1 - 3, wherein at least part of the outer periphery of said inner casing is flocked with short fibers.
7. A capacitor as claimed in any of claims 1 - 3, wherein glass-fiber material is wound around the outer periphery of said inner casing.
8. A capacitor substantially as described with reference tot he drawings.
12 Published 1989 C, The Patent Office. State House. 66.71 High Hc)lb,rn, Londcr.lk'C1R 4TP. Further copies maybe obtainedfrom. The Patent Office.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9114581A GB2244377B (en) | 1987-10-23 | 1991-07-05 | Capacitors |
| SG101592A SG101592G (en) | 1987-10-23 | 1992-10-07 | Capacitors |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987162873U JPH0347325Y2 (en) | 1987-10-23 | 1987-10-23 | |
| JP1987163767U JPH0347324Y2 (en) | 1987-10-27 | 1987-10-27 | |
| JP63023427A JPH01198009A (en) | 1988-02-02 | 1988-02-02 | Mold capacitor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8823781D0 GB8823781D0 (en) | 1988-11-16 |
| GB2211663A true GB2211663A (en) | 1989-07-05 |
| GB2211663B GB2211663B (en) | 1992-03-04 |
Family
ID=27284259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8823781A Expired - Lifetime GB2211663B (en) | 1987-10-23 | 1988-10-11 | Molded capacitor |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4881149A (en) |
| KR (1) | KR910008073B1 (en) |
| BE (1) | BE1002865A3 (en) |
| CH (1) | CH677417A5 (en) |
| DE (1) | DE3835484A1 (en) |
| FR (1) | FR2622345B1 (en) |
| GB (1) | GB2211663B (en) |
| HK (2) | HK45893A (en) |
| SG (1) | SG101692G (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787171B2 (en) * | 1990-04-06 | 1995-09-20 | ローム株式会社 | Method for manufacturing solid electrolytic capacitor |
| US6515842B1 (en) | 2000-03-30 | 2003-02-04 | Avx Corporation | Multiple array and method of making a multiple array |
| US6489850B2 (en) * | 2001-03-16 | 2002-12-03 | International Business Machines Corporation | Crosstalk suppression in differential AC coupled multichannel IC amplifiers |
| US7350281B2 (en) * | 2004-07-26 | 2008-04-01 | Hamilton Sundstrand Corporation | Method of protecting a capacitor |
| DE102004045182B4 (en) * | 2004-09-17 | 2008-10-16 | Epcos Ag | capacitor module |
| JP2007220794A (en) * | 2006-02-15 | 2007-08-30 | Toyota Motor Corp | Capacitor device |
| US9445532B2 (en) * | 2013-05-09 | 2016-09-13 | Ford Global Technologies, Llc | Integrated electrical and thermal solution for inverter DC-link capacitor packaging |
| US20160020031A1 (en) * | 2014-07-18 | 2016-01-21 | Samsung Electro-Mechanics Co., Ltd. | Composite electronic component and board having the same |
| US20160020033A1 (en) * | 2014-07-18 | 2016-01-21 | Samsung Electro-Mechanics Co., Ltd. | Composite electronic component and board having the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB840313A (en) * | 1957-05-13 | 1960-07-06 | Atomic Energy Authority Uk | Improvements in or relating to electric condensers |
| GB977848A (en) * | 1962-03-09 | 1964-12-16 | Morecambe Electrical Equipment | Improvements in and relating to assemblies of electrical elements |
| GB2173041A (en) * | 1985-03-22 | 1986-10-01 | Risho Kogyo Kk | High tension capacitor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE764753C (en) * | 1935-03-15 | 1953-06-22 | Siemens Schuckertwerke A G | Method for the assembly of capacitors, which consist of several partial capacitors arranged in a common oil-filled housing |
| US3335343A (en) * | 1964-04-07 | 1967-08-08 | Gen Electric | Electrical capacitor |
| US3364567A (en) * | 1965-09-14 | 1968-01-23 | Bell Telephone Labor Inc | Encapsulated electrical device and method of fabricating same |
| US3475659A (en) * | 1967-04-19 | 1969-10-28 | Gen Electric | Self-healing capacitor assembly |
| BE839688A (en) * | 1976-03-17 | 1976-09-17 | Acec | LOW AND MEDIUM POWER CAPACITOR |
| DD143977B1 (en) * | 1979-05-25 | 1983-03-30 | Claus Lerch | ELECTRIC CAPACITOR WITH MULTIPLE CAPACITY |
| DE3432746A1 (en) * | 1984-09-06 | 1986-03-13 | Chemische Fabrik Wibarco GmbH, 4530 Ibbenbüren | INSULATING OIL FOR ELECTRICAL MEDIUM AND HIGH VOLTAGE DEVICES |
| JPS61216417A (en) * | 1985-03-22 | 1986-09-26 | 利昌工業株式会社 | High voltage capacitor |
-
1988
- 1988-10-11 GB GB8823781A patent/GB2211663B/en not_active Expired - Lifetime
- 1988-10-12 US US07/262,736 patent/US4881149A/en not_active Expired - Lifetime
- 1988-10-18 DE DE3835484A patent/DE3835484A1/en active Granted
- 1988-10-20 KR KR1019880013661A patent/KR910008073B1/en not_active IP Right Cessation
- 1988-10-21 BE BE8801215A patent/BE1002865A3/en not_active IP Right Cessation
- 1988-10-21 FR FR888813793A patent/FR2622345B1/en not_active Expired - Lifetime
- 1988-10-24 CH CH3956/88A patent/CH677417A5/fr not_active IP Right Cessation
-
1992
- 1992-10-07 SG SG1016/92A patent/SG101692G/en unknown
-
1993
- 1993-05-13 HK HK458/93A patent/HK45893A/en not_active IP Right Cessation
- 1993-05-13 HK HK459/93A patent/HK45993A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB840313A (en) * | 1957-05-13 | 1960-07-06 | Atomic Energy Authority Uk | Improvements in or relating to electric condensers |
| GB977848A (en) * | 1962-03-09 | 1964-12-16 | Morecambe Electrical Equipment | Improvements in and relating to assemblies of electrical elements |
| GB2173041A (en) * | 1985-03-22 | 1986-10-01 | Risho Kogyo Kk | High tension capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| US4881149A (en) | 1989-11-14 |
| HK45993A (en) | 1993-05-21 |
| SG101692G (en) | 1992-12-04 |
| CH677417A5 (en) | 1991-05-15 |
| GB2211663B (en) | 1992-03-04 |
| HK45893A (en) | 1993-05-21 |
| KR910008073B1 (en) | 1991-10-07 |
| BE1002865A3 (en) | 1991-07-09 |
| FR2622345A1 (en) | 1989-04-28 |
| GB8823781D0 (en) | 1988-11-16 |
| DE3835484A1 (en) | 1989-05-03 |
| DE3835484C2 (en) | 1992-08-27 |
| KR890007324A (en) | 1989-06-19 |
| FR2622345B1 (en) | 1992-02-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20081010 |